Green’s Dictionary of Slang

to hurry up, to go quickly.

1918		Kia Ora Coo-ee 15 Apr. 18/1: I ordered Tom to stay in the lines, and then roused the other picquets, and iggried them off after ‘Abdul.’ [Ibid.] 20/3: Now, boys, […] one of you hoist her up and we’ll iggery to camp.
1987		E. Knox After Z-Hour 84: From the floor a voice said, ‘He locked it so he could iggry off and bury the body’.